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qUESTIONS

A set of ‘n’ equal resistors, of value ‘R’ each, are connected in series to a battery of emf ‘E’ and internal resistance ‘R’. The current drawn is I. Now, the ‘n’ resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 10.1. The value of ‘n’ is [2018]

A carbon resistor (47±4.7) kΩ is to be marked with rings of different colours for its identification. The colour code sequence will be [2018]

When a resistance of 2ohm is connected across the terminals of a cell, the current is 0.5 ampere. When the resistance is increased to 5 ohm, the current is 0.25 ampere. The internal resistance of the cell is [2011]

In the circuit shown in the figure, if the potential at point A is taken to be zero, the potential at point B is [2011]

A circuit contains an ammeter, a battery of 30 V and a resistance 40.8 ohm all connected in series. If the ammeter has a coil of resistance 480 ohm and a shunt of 20 ohm, the reading in the ammeter will be [2015]

A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) of necessary shunt will be [2012]

Six equal resistances are connected between points P, Q and R as shown in the figure. Then the net resistance will be maximum between [2004]

The resistance of the series combination of two resistances is S. When they are joined in parallel the total resistance is P. If S = nP, then the minimum possible value of n is [2004]

In the given circuit, it is observed that the current I is independent of the value of the resistance R6. Then the resistance values must satisfy [2001]

The current I drawn from the 5 volt source will be [2018]

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